Improvement in saws



L'HOLDEN.

Improvement in Saws.

Patented Marph 5,1872.

NI'IED STATES ATENT OFFICE.

JOSEPH HOLDEN, OF MIDDLETOYVN, NEW YORK.

IMPROVEMENT IN sAws.

Specification describing a new and Improved J oiners Back-Saw, inventedby JOSEPH HOL- DEN, of Middletown, in the county of Orange and State ofNew York.

My invention consists in having the back formed of a bar or rod of iron,preferably round, with one end fitting in a hole in the handle, so as toshift forward and back, with a nut screwing onto it against the handleto force the back outward, to strain the saw, which is connected to thehandle in the ordinary way, the other end of the back being extended toor toward the outer end of the sawblade, and connected to it forstraining it. The rod or bar forming the back is not grooved, and theback edge of the saw let into it, as in the case of the ordinaryback-saws; but the said back edge of the saw is intended to fit assnugly against the side of the back as it may and be free of it.

The principal object of the invention is economy in the expense of theconstruction; but it has other advantages, which will be pointed out.

Figure 1 is a side elevation of my improved saw, and Fig. 2 is a viewlooking toward the cutting-edge.

Similar letters of reference indicate corresponding parts.

The handle A has a slit, B, sawed in it to receive the end of thesaw-blade, as in other saws, for fastening by the screws; but,instead oftwo screws, 0, as commonly required, I use but one, being all that isneeded to hold the saw tight, owing to the adjustable back. The back I),which consists of a bar or rod of iron is fitted into a hole in thehandle, bored for it, as indicated by the dotted lines, and the partfitting said hole, together with a part beyond the handle, isscrew-threaded, and has a nut, E, fitted on it to screw against the endof the handle to strain the saw. The outer end F is flattened and bentaround toward the saw, and nicked to receive it sufficiently to beconnected to it by a pin or rivet, G, passing through a hole in the saw,and either resting in a notch in the outer end or passing through ahole, H, in said end.

This mode of attaching the back to the wood handle is much cheaperthanthe connection of the ordinary fiat back, for the hole is formed byboring, while a recess or cavity must be worked into the handle bychisels for the flat back, which requires much more labor and time. Thefiat backs are very expensive to make, whereas I take any suitable baror rod of the right size, and completeit by forming the screw-thread forthe nut and shaping the outer end for connecting the saw-blade to it,both of which are simple operations.

Again, when the back is formed in the old way, the saw, being placed inthe groove in the back for it, is secured by hammering the sides of theback to pinch them upon the blade to hold it. This warps and buckles thesaw to a considerable extent, for it'is impossible to hammer the sidesalike throughout their length, and this buckling of the saw must behammered out after it is connected to the back, all of which is avoidedby my improvement.

When the saw is once connected to the back in the old way it cannot bedisconnected for filing and setting, which is objectionable, because theback and the handle interfere greatly with placing the blade in a viseor clamp for filing, or on a plank in 'a setting apparatus for setting;whereas, by this plan, the pin Gr being removed, the blade can be whollydetached, or be swung away from the back on the screw 0, to be placed inthe vise.

After the wood handle has shrunk the blades get loose and shift about inthe handle so as to interfere considerably with doing work well by themwhen connected in the old way; whereas, when arranged according to myimprovement, they can be kept tight by the adjusting-nut E, although thehandle shrinks to any extent it is liable to.

It will be seenthat the back may be adjusted readily for saws, varyingconsiderably in length, for it may extend into the handle more or lesswithin a considerable range of varia tion.

Having thus described myinvention, I claim as new and desire to secureby Letters Patent- The backsaw, herein described, when formed with thesaw-blade A, back-bar D, and han dle A, and connected together in themanner herein described.

The above specification of my invention signed by me this 26th day ofAugust, 1871.

JOSEPH HOLDEN.

Witnesses:

GEo. W. MABEE, T. B. Mosuna.

